[Pillars]

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It has nothing to do with luck, and everything to do with reasons for selecting certain opponents in poker as opposed to SC.

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You're still being kinda vague here. There are always a number of competing reasons for selecting one's opponents, in both poker and Starcraft.

The two goals which are often in opposition are:

1.) Win [games / ladders / tournaments in Starcraft, money in poker.]
2.) Improve as a player.

Generally you'll want to play the weakest opposition possible if you're focused on winning, and either equivalent or slightly superior opponents if you're focused on improving.

Are you claiming that there's a fundamental difference between the two games in terms of opponent selection?